Synonyms for Begun:

adj.

originated (adjective)
Inaugurated.
set in motion (adjective)
Undertaken.
started (adjective)
in progress, happening, initiated, operative, operational, in motion, going, working, proceeding, under way.
underway (adjective)
under way, in progress.

n.

in force, advanced, proceeding, operative, in progress, operational, in motion, existing, happening, active, going, working, on foot, under way.

v.

began (verb)
Emerged, Inducted, Germinated, Sprang, Budded, Inaugurated, Originated, Undertook, birthed, Created, formed, Began, initiated, Introduced, Undertaken, stemmed, Embarked, started, developed, sprouted, hatched, Commenced, prepared, conceived, Dawned, initialized, Sprung.
originated (verb)
produced, Generated, Instituted, invented.

Other synonyms:

Other relevant words:
happening, going, under way, working, in motion, proceeding, operative, operational, in progress.

Usage examples for Begun

  1. " We've only begun said the general. – Their Silver Wedding Journey by William Dean Howells
  2. Do you know, I had begun to think they would not be. – Martin Pippin in the Apple Orchard by Eleanor Farjeon
  3. Of course it was all begun long before I was old enough to understand. – Flower of the Dusk by Myrtle Reed